This patch adds a radiobox to allow the user to select a reference point for
the move. The additional options are: User Origin (set with <space>),
Grid Origin and Sheet Origin (effectively making it an absolute coordinate).
A checkbox is added (where it makes sense) to allow overriding which point
within the component is put on top of the designated coordinate.
Fixes: lp:1460460
* https://bugs.launchpad.net/kicad/+bug/1460460
Pcbnew: Plot files: for copper layers, create suffix from user copper layer names instead of default copper layer names, like in last stable Kicad version (bzr 4022), to build the plot files filenames.
Better test of illegal chars in plot filename, both in plot dialog and functions aclled by Python scripts.
Fix a Plotcontroller issue to make SetUseGerberExtensions() work as expected from Python scripts ( from Henner Zeller'patch with a fix to be sure it works properly from a Python script)
Note also using Protel Gerber Extensions is now a bad practice, because the official Gerber extension is .gbr since X2 Gerber version. But some users still use them)
Robbert Lagerweij
Simon Richter
jean-pierre charras
John Beard